Shia support modi if I am not wrong.
Only mercantile Shia sects that are prosperous (like Dawoodi Bohras in GUJ and MP) - those people still have some semblance of brains/pragmatism - and in GUJ they benefitted under Modi's good/business friendly administration.
Beyond that, Shias in UP are pretty firmly with BJP due to Sunni bullying (Rizvi of Shia Waqf supporting RJB, Shia Gau Rakshak Dals, Hussaini Tigers etc). But other than that, there's no special Shia or Muslim relationship w/ BJP or Modi. Muslims are ultimately Muslims.
There may be potential to play Sunnis and Shias against each other in J&K if the situation/numbers etc are conducive; but even Shia extremists (Ayatollah fans) are ultimately rabid - and they actually have an even greater penchant for martyrdom due to the history of Hussain, Ali, Karbala etc